Kicking off his campaign for the next Lok Sabha elections in the southern states here on Sunday, Prime Minister Narendra Modi came down heavily on the opposition parties.Modi was on a day-long visit to the states of Tamil Nadu, Karnataka and Andhra Pradesh for the launch of several developmental projects as well as his poll campaign. He visited Guntur in Andhra Pradesh, Raichur in Karnataka and Tiruppur in Tamil Nadu.Addressing a public rally in Tiruppur, about 470 km from the state capital Chennai, Modi said, "For us, social justice is an article of faith and not a mathematical formula, the way it is for the opposition parties."He said it was the NDA government led by Atal Bihari Vajpayee that restored reservation in promotions for the SC/ST, a privilege that was scrapped by the Congress-led UPA government at the Centre earlier.Referring to his government's decision to provide 10 per cent reservation to the economically backward sections, Modi said the move aims at equality of opportunities to all.He said the 10 per cent reservation will not affect the existing reservation for SC/ST and Other Backward Communities.Alleging that the opposition was good at spreading panic and misleading the youth, farmers and other sections of society, the Prime Minister said that for a long time the opposition parties had created tension in society on the issue of social justice.Modi criticised the Congress' farm loan waiver scheme saying that it would not benefit anybody, but would result in an extra burden of Rs 50,000 crore.He said for the first time in India's history, his government had announced a Rs 6,000/pa income scheme for farmers' holding less than five acres of land.When the scheme was announced in Parliament the opposition parties were left shocked, he added.